Previously on thread I made on the heating issue HeavyEquipmentForums I thank each an everyone that help with their input. I came to discover that it was the fan that slow down after few mins operation. Both the Fan pump and fan motor are ok. The issues now lies within the fan Valve, it's component are; Fan Valve AT366516 1. Speed control solenoid 2. Direction control solenoid 3. Pressure sensor 4. Check Valves (4 pieces) I once blocked the 4 check valves and fan blows at highest speed, when engine is throttled it speed dangerously and the shock can break something. I had to unblock and load the check valve with spring with more force. I now start slow under 30mins of work.. I will really appreciate if I can get the exact hydraulic schematic of the machine John Deere Grader 770G Serial Number DW770GX625056
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